your such a know it all arn't you.. why just cause you have a dispensary. i can to but i choose not to cuz it is still illegal yet to do so unless you OWN your own building..
how big is the space you are growing in.. but i would go with 5 or 6 myself. i have seen 1st hand on 2 plants grown with 13 cfls.. buds looked nice and the plants looked nice and full